Did you ever find a solution to this? I'm also seeing duplicate samples returned sometimes, but can't figure out a way to reproduce it reliably.

Having the same issue here. Any resolution or workarounds that anyone has found?

Noticed the same thing, but I thought it might be a "feature" rather than a bug.

I also am working on a workout app, and it makes no sense to have a live activity for it on the watch. We have a watchOS app already, which shows all the workout info as you workout, so having a live activity is redundant and confusing. I also worry that it causes issues with the connection between iPhone and Apple Watch. We already have issues occasionally with delayed communication between the devices (usually due to interference from lots of other nearby devices), so this will only make it worse if the phone is sending even more information to the watch that is unnecessary and unhelpful. This honestly has me considering removing the Live Activity feature from the app altogether, especially since iOS 18 drastically reduced the frequency of updates allowed. Instead of being able to update the Live Activity every second, now it's down to once every 5 - 15 seconds, which just feels ridiculous for a workout app.